Looking at your post now was the first post I’ve seen since the latest build that shows zaps. Seems that it’s not consistent on Damus.
Discussion
You’ll only see it on posts where the person receiving the tips have a nip-57 compatible wallet. I use LN.tips which rolled out full support in the last day or so. As more wallets support it you’ll start seeing it more.
Hmmm, I see now. I’ll need to see how that works with nostrplebs forwarding to a WoS wallet.